一:
1.(1)56/40:(56/8)/(40/8)=7/5
(2)27/15:(27/3)/(15/3)=9/5
(3)7/57/5
3.(1)64/24:(64/8)/(24/8)=8/3
(2)21/12:(21/3)/(12/3)=7/4
(3)8/3((8x4)/(3x4)=32/12)>7/4((7x3)/(4x3)=21/12)
二:
1.32/80:(32/16)/(80/16)=2/5
2.120/125:(120/5)/(125/5)=24/25
3.52/39:(52/13)/(39/13)=4/3
4.28/140:(28/28)/(140/28)=1/5
5.34/17:(34/17)/(17/17)=2/1=2
6.60/45:(60/15)/(45/15)=4/3
7.21/14:(21/7)/(14/7)=3/2
8.55/22:(55/11)/(22/11)=5/2